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Metallurgical and Materials Transactions B

, Volume 3, Issue 11, pp 2865–2872 | Cite as

Activity of carbon and solubility of carbides in the FCC Fe-Mo-C, Fe-Cr-C, and Fe-V-C alloys

  • T. Wada
  • H. Wada
  • J. F. Elliott
  • J. Chipman
Physical Chemistry

Abstract

The activity of carbon in austenitic Fe-Mo-C, Fe-Cr-C, and Fe-V-C alloys has been studied by equilibration with controlled CH4-H2 atmospheres at temperatures in the range 850° to 1200°C. The observations included a number of compositions in the two-phase fields, γ + carbide. Equations are given for the activity coefficient of carbon as a function of temperature and composition in the austenite field and from these the other thermodynamic properties of the solution may be computed as desired. The phase boundaries γ/γ + carbide were determined by breaks in the isoactivity lines. This was supplemented in the case of Fe-Mo-C alloys by metallographic linear analysis of equilibrated samples. The results confirm certain published phase diagrams and discredit others.

Keywords

Carbide Austenite Metallurgical Transaction Phase Boundary Activity Coefficient 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© The Metallurgical of Society of AIME 1972

Authors and Affiliations

  • T. Wada
    • 1
  • H. Wada
    • 2
  • J. F. Elliott
    • 3
  • J. Chipman
    • 3
  1. 1.Climax Molybdenum CompanyAnn Arbor
  2. 2.University of MichiganAnn Arbor
  3. 3.Department of Metallurgy and Materials ScienceMassachusetts Institute of TechnologyUSA

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